1. Europainclinics, Bratislava, Slovak Republic
2. Europainclinics, Poliklinika Terasa, Košice, Slovak Republic
3. Europainclinics, Bardejov, Slovak Republic, Slovak Republic
4. Clinic of Anaesthesiology and Intensive Care Medicine, East Slovak Institute of Cardiovascular Disease, Košice, Slovak Republic
5. Institute of Measurement Science, Slovak Academy of Sciences, Bratislava, Slovak Republic
6. Europainclinics, Prague, Czech Republic
7. Clinic of Anaesthesiology and Intensive Care Medicine, Railway Hospital and Clinic Košice, Košice, Slovak Republic
8. Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, Slovak Republic
9. Department of Neurosurgery, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, and Louis Pasteur University Hospital, Košice, Slovak Republic.